Safety stop for elevators



T. DONEFF Fiied Aug. 5, 19:51

SAFETY STOP FOR ELEVATORS 4 Sheets-Sheet 1 avi.

o lyd was 7,-

d I I A. Inveritor May 24, 1932. DONEF'F 1,860,018

SAFETY STOP FOR ELEVATORS I Filed Aug. 5, 1931 4 Sheets-Sheet 2 /J Invqnlor May 24, 1932. DQNEFF 1,860,018

SAFETY STOP FOR ELEVATORS Filed Aug. 5, 1931 4 Sheets-Sheet 3 Inventor T. DONEF'F' 1,860,018

SAFETY STOP FOR ELEVATORS May 24, 1932.

Filed Aug. 5, 1951 4 Sheets-Sheet 4 Patented May 24, 1932 UNITED STATES.

'roivr DoNErr', or BURNHAM, PENNSYLVANIA I i SAFETY sror roa ELnvA-roRs Application filed August 5, 1931. Serial No. 555,290- r The present invention relates generally to elevators and more particularly for means to stop the elevator should the same start to fall because of a broken cable or the like and the object of the invention resides in the provision of a mechanism in the form of a safety stop which is simple in its construction, thoroughly efficient in use and operation, compact and convenient in its arrangement of parts and otherwise well adapted to the purpose for which it is designed.

l/Vith the above and numerous other objects in View as will appear as the description proceeds, the invention resides in certain novel features of construction, and in the combination and arrangement of parts as will be hereinafter more fully described and claimed.

In the drawings:

Figure 1 is a front elevation of an elevator frame showing my improved mechanism associated therewith.

Figure 2 is a side elevation thereof.

Figure 3 is a'rear elevation of the upper portion of the frame showing the mechanism in released position.

Fi ure 4 is a similar view showing the mechanism in engaged position.

Figure5 is a top plan view thereof.

Figure 6 is another top plan view showing portions of the frame in section, and

Figure 7 is a perspective view of a lever.

Referring to the drawings in detail it will be seen that numerals 5 denote the rails of The cranks 14 are located on opposite sides of the axis of the shaft 11 while the cranks 15 extend to one side thereof. An arm 16 is the elevator shaft and numeral 6 denotes fixed to one end of the crankshaft 11 and has a weight element 17 on the extremity. thereof which normally gravitates downwardly but is' held in a'raised position by a finger 18 engaging an intermediate portion of the lever 16 adj acentthe weight element. This finger 18 projects laterally from a lever 19 of angu- 1211' construction having an intermediate portion rockablymounted as at: 20 onfone-of the plates 10 and an offset extremity at the otherf end thereof as at 21; Numeral 22-denotes an angularly constructed lever pivotallymount ed as at ,23 on the last mentioned plate/10" and having an ofi'setextremity 24 to engage over top of the inner end-offthe lever 19. i A spring is engaged with the arm 16 adjacent the weight 17 and is anchored on a bracket 26 projecting inwardly from one of the sides 7'to yieldably retain the arm- 16 in thepo'sition shown'in Figure 4. V

Numeral 27 denotes a hoisting cable of'the elevator and a cable or the like 28 is" en- 7 gaged therewith and engaged with theou'ter end of the lever 22. When the cable 27 is taut as shown in Figure 3,-then the levers 22 and 19 are disposed as to hold the weight element and its lever in an upward position but should i the cable 27 become slack for any'reason this permits the weight element to gravitate down wardly and turn the crank shaft.

Numerals 3O denote serrated faced shoes s-lidable through sides 7 below the topof the frame. I Numerals 31 denote serrated faced shoes slidab-le through theupp er end por.

tions of the sides 7 Links 32 are engaged on cranks 14 and are pivotally engaged with the shoes 31 ,while links 32 are engaged on cranks 15 and with "the'shoes 80. Now when the crank shaft 11 is in the position shown in Figures 1 and 3 the shoesare disposed in re-v 190 tracted position out of engagement with the rails 5 but when the crank shaft is in the position shown in Figure 4 then the shoes are forced outwardly into engagement with the rails to cause thestopping of the elevator on the downward movement. r V It is thought that the construction, opera-- tion, utility and advantagesof this invention will now be quite apparent to those skilled oo' in this art without a more detailed description thereof.

The present embodiment of the invention has been described in considerable detail merely for the purposes of exempllfication since in actual practice it attains the features of advantage enumerated as desirable in the statement of the invention and the a-loovede-v scription.

It will be apparent that changes in the details of construction, and inthe combination and arrangement of parts may be resorted to without departing from the spirit or scope-of the invention as hereinafter claimed or sacrificing any of its advantages. 7

Having thus described my invention, what I claim as new is:

1. In combination, a pair of elevator shaft rails, a frame between therails, said frame including side members, shoes 'slidable in the side members to engage the rails, a crank shaft having cranks, rods engaged with the cranks and with the shoes, a, lever projecting from the crank shaft and having a weight on the outer end thereof tending to normally rock the shaft for engaging the shoes with the rail, a lifting v we cable for the frame, means operatively dis-' posed between the cable'and the lever permitting the lever to gravitate downwardly when the cable is slack but otherwise holding the lever upwardly.

V the crankshaft and having a weight on the c 2. In combination, a pair of elevator shaft rails, a frame between therails, said framein: eluding side members, shoes slidable in r the side members to engage the rails, a crank shaft having cranks, rods engaged with the cranks and with the shoes, a lever projecting from outer end thereof tending to normally rock the shaft for engagingthe shoeswi'th theirail,

a-lifting cable for the frame, meansoperw; tively disposed between the cable and the lever permitting the lever to gravitate down wardly when the cable is slack but otherwise o holding the lever upwardly, said means comprising a pair of levers rockable onthefra-me andhaving inner ends one overlapping the other, the outer end of one ofthe levers having a finger to engage under the weighted lever, and a connection between the outer end of the other lever and-the cable.

In testimony whereof I affix my signature. TOM DONEFF. 

